Emollient durability enhancing siloxanes

Abstract

A method of enhancing the durability of an emollient material on a substrate by forming a mixture of an emollient material and an effective amount of an organosilicon compound, and applying the mixture to the substrate to be treated. The organosilicon compound is either an aminofunctional, amidofunctional, or carboxyfunctional, polysiloxane. A skin conditioning composition of enhanced durability is also disclosed which is a mixture of an emollient material and an effective amount of an organosilicon compound which is either an aminofunctional, amidofunctional, or carboxy functional, polysiloxane.

That which is claimed is: 
     
       1. A method of enhancing the durability of an emollient material on human skin comprising applying to human skin a mixture of an emollient material and an effective amount of an organosilicon compound, the organosilicon compound being an amidofunctional siloxane having an average of 50 to 1000 siloxane units per molecule with an average of 1 to 50 of the siloxane units per molecule being amide-containing siloxane units bearing a substituent of the formula ##STR8## wherein n is 0 or 1, R' denotes an alkylene radical of 3 to 6 carbon atoms, and R'' denotes a hydrogen radical or an alkyl radical of 1 to 6 carbon atoms, X denotes an acyl radical of the formula ##STR9## X' denotes a hydrogen radical or X, and R''' denotes an alkyl radical of 1 to 4 carbon atoms and substantially all other organic substituents in the polysiloxane being methyl groups, the emollient material being selected from the group consisting of (i) straight, branched, and cyclic hydroxy compounds containing 1 to 30 carbon atoms, (ii) straight, branched, and cyclic carboxylic acids containing 1 to 31 carbon atoms, (iii) alkanes of the formula H--(CH 2 ) n  --H wherein n is 5 to 30, and (iv) siloxanes. 
     
     
       2. The method of claim 1 in which the amidofunctional polysiloxane is a compound having the formula Me 3  SiO(Me 2  SiO) x  (MeRSiO) y  SiMe 3  in which Me is methyl; R is the functional group --(C 4  H 8 )NH(CH 2 ) 2  NHCOCH 3  ; x is an integer from fifty to one thousand; and y is an integer from one to fifty. 
     
     
       3. The method of claim 2 in which the emollient and the polysiloxane are present in the mixture in the ratio of four to one. 
     
     
       4. The method of claim 2 in which the emollient and the polysiloxane are present in the mixture in the ratio of two to one. 
     
     
       5. The method of claim 3 in which the mixture of the emollient and the polysiloxane includes a volatile cyclic siloxane solvent. 
     
     
       6. The method of claim 5 in which the volatile cyclic siloxane is a low viscosity polydimethylcyclosiloxane fluid. 
     
     
       7. The method of claim 6 in which the polydimethylcyclosiloxane fluid is a mixture of cyclic tetramers and pentamers and has a viscosity of about 2.5 centistokes measured at twenty-five degrees Centigrade. 
     
     
       8. The method of claim 7 in which the mixture contains about five to ten percent by weight of the emollient and the polysiloxane in the volatile cyclic siloxane solvent. 
     
     
       9. The method of claim 1 in which the emollient is a material selected from the group consisting of mineral oil, mink oil, lanolin oil, and petrolatum. 
     
     
       10. A skin conditioning composition of enhanced durability comprising a mixture of an emollient and an effective amount of an organosilicon compound, the organosilicon compound being an amidofunctional polysiloxane having an average of 50 to 1000 siloxane units per molecule with an average of 1 to 50 of the siloxane units per molecule being amide-containing siloxane units bearing a substituent of the formula ##STR10## wherein n is 0 or 1, R' denotes an alkylene radical of 3 to 6 carbon atoms, and R'' denotes a hydrogen radical or an alkyl radical of 1 to 6 carbon atoms, X denotes an acyl radical of the formula ##STR11## X' denotes a hydrogen radical or X, and R''' denotes an alkyl radical of 1 to 4 carbon atoms and substantially all other organic substituents in the polysiloxane being methyl groups, the emollient material being selected from the group consisting of (i) straight, branched, and cyclic hydroxy compounds containing 1 to 30 carbon atoms, (ii) straight, branched, and cyclic carboxylic acids containing 1 to 31 carbon atoms, (iii) alkanes of the formula H--(CH 2 ) n  --H wherein n is 5 to 30, and (iv) siloxanes. 
     
     
       11. The composition of claim 10 in which the amidofunctional polysiloxane is a compound having the formula Me 3  SiO(Me 2  SiO) x  (MeRSiO) y  SiMe 3  in which Me is methyl; R is the functional group --(C 4  H 8 )NH(CH 2 ) 2  ; x is an integer from fifty to one thousand; and y is an integer from one to fifty. 
     
     
       12. The composition of claim 11 in which the emollient and the polysiloxane are present in the mixture in the ratio of four to one. 
     
     
       13. The composition of claim 11 in which the emollient and the polysiloxane are present in the mixture in the ratio of two to one. 
     
     
       14. The composition of claim 12 in which the mixture of the emollient and the polysiloxane includes a volatile cyclic siloxane solvent. 
     
     
       15. The composition of claim 14 in which the volatile cyclic siloxane is a low viscosity polydimethylcyclosiloxane fluid. 
     
     
       16. The composition of claim 15 in which the polydimethylcyclosiloxane fluid is a mixture of cyclic tetramers and pentamers and has a viscosity of about 2.5 centistokes measured at twenty-five degrees Centigrade. 
     
     
       17. The composition of claim 16 in which the mixture contains about five to ten percent by weight of the emollient and the polysiloxane in the volatile cyclic siloxane solvent. 
     
     
       18. The composition of claim 10 in which the emollient is a material selected from the group consisting of mineral oil, mink oil, lanolin oil, and petrolatum.